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I know my basement is pretty leaky, so I decided to try and seal it from the upstairs (at least for now). So, I started with the basement door. I noticed that when the furnace is on large amounts of air are being pulled through the door into the basement. So, first I mounted a door sweep on the bottom of the door.
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How is your furnace getting the make-up air now that you've just cut it off? You might be adding hazard here considering your basement goes into negative pressure when the furnace is running. Do you have an air inlet into your basement?